You estimate the heritability for the length of tails in two populations of deer mice. The first population is from the mainland and has been long established. The second population was recently introduced to a small island via human activity. You estimate a heritability of 0.7 for the mainland population and a heritability for tail length of 0.3 for the island population. What are likely contributors that help explain the difference in heritability between the two populations. Multiple answers could be right. 1) The introduction on the island led to a genetic bottleneck that reduced genetic variation in the island mice. 2) On the mainland, food is always abundant for all mice, while access to food is highly variable among mice on the island. 3) The island environment is much more uniform than the mainland environment. 4) Island mice have on average shorter tails than the mainland population.
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